feat(db): extraction des embeddings + mode WAL + config DB provider-agnostic

- Ajout de la table de relation 1-1 NoteEmbedding pour alléger Model Note
- Refactor complet des actions IA sémantique et Memory Echo pour utiliser la jointure
- Migration propre des 85 embeddings locaux existants
- Ajout PRAGMA journal_mode=WAL pour la concurrence au sein de lib/prisma
- Ajout npm run db:switch pour configuration auto SQLite / PostgreSQL
- Fix du compilateur Turbopack et Next-PWA

keep-notes/app/actions/notes.ts

@@ -349,8 +349,9 @@ async function semanticSearch(query: string, userId: string, notebookId?: string
     where: {
       userId: userId,
       isArchived: false,
-      ...(notebookId !== undefined ? { notebookId } : {}) // NEW: Filter by notebook (IA5)
-    }
+      ...(notebookId !== undefined ? { notebookId } : {})
+    },
+    include: { noteEmbedding: true }
   });
 
   const queryLower = query.toLowerCase().trim();
@@ -380,8 +381,8 @@ async function semanticSearch(query: string, userId: string, notebookId?: string
     // Semantic match (if embedding available)
     let semanticMatch = false;
     let similarity = 0;
-    if (queryEmbedding && note.embedding) {
-      similarity = cosineSimilarity(queryEmbedding, JSON.parse(note.embedding));
+    if (queryEmbedding && note.noteEmbedding?.embedding) {
+      similarity = cosineSimilarity(queryEmbedding, JSON.parse(note.noteEmbedding.embedding));
       semanticMatch = similarity > 0.3; // 30% threshold - works well for related concepts
     }
 
@@ -450,7 +451,6 @@ export async function createNote(data: {
         reminder: data.reminder || null,
         isMarkdown: data.isMarkdown || false,
         size: data.size || 'small',
-        embedding: null, // Generated in background
         autoGenerated: data.autoGenerated || null,
         notebookId: data.notebookId || null,
       }
@@ -480,9 +480,10 @@ export async function createNote(data: {
         const provider = getAIProvider(await getSystemConfig())
         const embedding = await provider.getEmbeddings(content)
         if (embedding) {
-          await prisma.note.update({
-            where: { id: noteId },
-            data: { embedding: JSON.stringify(embedding) }
+          await prisma.noteEmbedding.upsert({
+            where: { noteId: noteId },
+            create: { noteId: noteId, embedding: JSON.stringify(embedding) },
+            update: { embedding: JSON.stringify(embedding) }
           })
         }
       } catch (e) {
@@ -579,9 +580,10 @@ export async function updateNote(id: string, data: {
           const provider = getAIProvider(await getSystemConfig());
           const embedding = await provider.getEmbeddings(content);
           if (embedding) {
-            await prisma.note.update({
-              where: { id: noteId },
-              data: { embedding: JSON.stringify(embedding) }
+            await prisma.noteEmbedding.upsert({
+              where: { noteId: noteId },
+              create: { noteId: noteId, embedding: JSON.stringify(embedding) },
+              update: { embedding: JSON.stringify(embedding) }
             })
           }
         } catch (e) {
@@ -863,14 +865,23 @@ export async function syncAllEmbeddings() {
   const userId = session.user.id;
   let updatedCount = 0;
   try {
-    const notesToSync = await prisma.note.findMany({ where: { userId, embedding: null } })
+    const notesToSync = await prisma.note.findMany({ 
+      where: { 
+        userId, 
+        noteEmbedding: { is: null }
+      } 
+    })
     const provider = getAIProvider(await getSystemConfig());
     for (const note of notesToSync) {
       if (!note.content) continue;
       try {
         const embedding = await provider.getEmbeddings(note.content);
         if (embedding) {
-          await prisma.note.update({ where: { id: note.id }, data: { embedding: JSON.stringify(embedding) } })
+          await prisma.noteEmbedding.upsert({
+            where: { noteId: note.id },
+            create: { noteId: note.id, embedding: JSON.stringify(embedding) },
+            update: { embedding: JSON.stringify(embedding) }
+          })
           updatedCount++;
         }
       } catch (e) { }

keep-notes/app/api/admin/embeddings/validate/route.ts

@@ -29,7 +29,7 @@ export async function GET() {
       select: {
         id: true,
         title: true,
-        embedding: true
+        noteEmbedding: true
       }
     })
 
@@ -45,7 +45,7 @@ export async function GET() {
 
     for (const note of allNotes) {
       // Check if embedding is missing
-      if (!note.embedding) {
+      if (!note.noteEmbedding?.embedding) {
         missingCount++
         invalidNotes.push({
           id: note.id,
@@ -57,8 +57,8 @@ export async function GET() {
 
       // Validate embedding
       try {
-        if (!note.embedding) continue
-        const embedding = JSON.parse(note.embedding) as number[]
+        if (!note.noteEmbedding?.embedding) continue
+        const embedding = JSON.parse(note.noteEmbedding.embedding) as number[]
         const validation = validateEmbedding(embedding)
 
         if (!validation.valid) {